Android关于Bitmap的几个方法

1.保存Bitmap到SD卡

	private String ALBUM_PATH = Environment.getExternalStorageDirectory().getAbsolutePath() + "/";

	private void saveFile(Bitmap bm) throws IOException {
		File dirFile = new File(ALBUM_PATH);
		if (!dirFile.exists()) {
			dirFile.mkdir();
		}
		File myCaptureFile = new File(ALBUM_PATH + "bitmap.jpeg");
		BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(myCaptureFile));
		bm.compress(Bitmap.CompressFormat.JPEG, 80, bos);
		bos.flush();
		bos.close();
	}

	private Bitmap smallBitmap(Bitmap bitmap) {
		Matrix matrix = new Matrix();
		matrix.postScale(0.33f, 0.33f); // 长和宽放大缩小的比例
		Bitmap resizeBmp = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
		return resizeBmp;
	}

	private Bitmap convertViewToBitmap(View view) {
		Bitmap bitmap = Bitmap.createBitmap(view.getWidth(), view.getHeight(), Bitmap.Config.ARGB_8888);
		view.draw(new Canvas(bitmap));

		return bitmap;
	}

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